Basic Math Examples

$\frac{y^{2} - 18 x + 81}{y^{2} - 3 x - 54} \div \frac{y^{2} - 81}{6}$

Step 1

Rewrite $81$ as $9^{2}$ .

$\frac{y^{2} - 18 x + 81}{y^{2} - 3 x - 54} \div \frac{y^{2} - 9^{2}}{6}$

Step 2

Since both terms are perfect squares, factor using the difference of squares formula, $a^{2} - b^{2} = (a + b) (a - b)$ where $a = y$ and $b = 9$ .

$\frac{y^{2} - 18 x + 81}{y^{2} - 3 x - 54} \div \frac{(y + 9) (y - 9)}{6}$